Profiling dresser for grinding machine



N 955 H. s. JAKOBSEN PROFILING DRESSER FOR GRINDING MACHINE 2Sheets-Sheet 1 Filed Sept. 21 1950 Fig. I

INVENTOR. Harry S. Jakobsen BY TO NEY.

Nov. 29, 1955 H. s. JAKOBSEN 2,725,049

PROFILING DRESSER FOR GRINDING MACHINE Filed Sept. 21, 1950 2Sheets-Sheet 2 IIIIIIIIITIIUI INVENTOR. Harry S. Jakobsen ATT RNEY.

United States Patent 2,725,049 PROFILING DRESSER Fort GRINDING MACHINEHarry S. Jakobseu, Washington Township, Morris County, N. 3., assignortoAirborne Accessories Corpor'a'tiori, Hillside, N. J., a corporation ofNew Jersey Application September 21, 1950, Serial No. 185,949

2 Ciaims. (Cl. 125-11) This invention relates to a profiling dresser forgrinding machines, and is shown as an accessory to a grinding machineembodying a grinding wheel.

The object of the invention is to provide as an accessory to a grindingmachine a simple and efficient means for mounting a dresser tool andtracer so that they may be readily swung to and from position withreference to the grinding wheel, and may also be easily reversed inposition to bring the tracer into contact with the wheel and the dressertool in position against a template.

(Dther objects and advantages of the invention will be in part obviousand in part pointed out hereinafter.

The invention accordingly comprises the features of construction,combinations of elements, and arrangement of parts, which will beexemplified in the construction hereinafter set forth, and the scope ofthe application of which will be indicated in the claims.

For a fuller understanding of the nature and objects of the inventionreference should be had to the following detailed description taken inconnection with the accompanying drawings, in which:

Figure 1 is a side elevation illustrating a conventional grinding wheelwith a dresser tool mounted in accordance with my invention foroperation thereon;

Fig. 2 shows the reversal of the part carrying the dresser tool and thetracer as compared with the showing of Fig. 1;

Fig. 3 is a top plan view looking down on the mechanism shown in Fig. 1;and

Fig. 4 is an enlarged detail showing the means for adjustably mountingthe dresser tool and the tracer within the adjustable and reversiblemember by which they are carried.

In the drawings A is a conventional illustration of a grinding wheelupon a suitably driven shaft a, carried by an upright or column B, whichin turn is supported by the base C of any of the well known forms ofgrinding machines.

Shown in operating position with reference to the grinding wheel A is adresser tool 1, commonly called in the trade a diamond point. This toolis mounted on member 2, and carried by the lower end of member 2 is atracer 3 working over a template 4 adjustably and moveably carried, asby set screw 5, on the block 6 adjustably mounted upon the base C.Member 2 is mounted upon the member 7 as by the sliding dovetailconnections 8 and 9 shown in Figs. 1 and 2, so that the member 2 may beadjustably moved along the member 7 and held in place at any desiredadjusted position by the set screws 10, and may also be moved frommember 7 and replaced in reverse position with the dresser tool at thelower end and the tracer at the upper end.

The member 7 is pivotally mounted on member 11 as by the pivot rod 12passing through the opening in member 11, and member 11 is similarlypivotally mounted upon the column B by the pivot rod 13 carried bycolumn B and passing through the inner end of member 11. Said members 7and 11 constitute a carrier for block or member 2 and has universalmovement in a plane.

2,725,049 Patented Nov. 29,1955

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Turning. now to the more detailed showing of Fig. 4, the dresser tool 1is carried in the cut out of the part 16 which is carried by 2, and thetool is adjustable horizontally to a point fixed by the position of theset screw 14 and held in any desired position by the set screw 15. The

part 2' at its lower end carries tracer 3 adjustably mounted therein byblock 18 and set screw 20',

It will now be seen that with the construction shown, the dresser toolis pivotally mounted on the grinding machine so that it can be foldedand swung out of the way when not in use. The dresser tool and tracerare mounted in the upper and lower'ends, respectively, of a precisionadapter readily detachable from the rest of the assembly. Flexibility isprovided by the two intermediate pivot points. The dressing is performedby guiding the tracer by hand over the template contour. Extremerigidity of the pivoted members permits the tool to reproduce faithfullythe exact form required on the wheel. The universal action of the hingeddresser tool combined with the ability to rotate the tool and tracergives the utmost freedom to the tracing motion. The two swivel joints ofthe dresser tool duplicates the action of the human arm, and theoperation is as effortless as drawing with a pencil.

With the construction as shown there is also provided simple means ofcorrecting the tracer nose to correspond exactly to the shape of thediamond point. Variation in diamond contour from the theoretical shapeis the major source of inaccuracy, which necessarily depends on theprecise diamond form and dimension. The unit holding the diamond and thetracer is easily removed from the dresser tool. Then this unit may beplaced on the base and the wheel dressed to the exact form of thediamond. Then the nose of the profile tracer can be ground to the formof the exact shape of the diamond point. The unit can then be replacedwith the dresser tool ready for the grinding process. Or this correctioncan be made by reversing the position of the tool and tracer carryingmember, as shown in Fig. 2.

The wheel is first dressed to the approximate shape of the templateselecting the straightest portion of the template for this operation,then the reversal of part 2 is made as shown in Fig. 2, and the tracerwill be ground to the exact counterpart of the diamond tool by arotating or oscillating motion, holding the diamond against the templateand letting the periphery of the wheel thereby grind the same contour onthe tracer.

Since certain changes may be made in the above construction, anddifferent embodiments of the invention could be made without departingfrom the scope thereof, it is intended that all matter contained in theabove de' scription or shown in the accompanying drawing shall beinterpreted as illustrative and not in a limiting sense.

It is also understood that the following claims are intended to coverall of the generic and specific features of the invention hereindescribed, and all statements of the scope of the invention which as amatter of language might be said to fall therebetween.

I claim:

1. In a grinding machine having a base, an upright supported on the baseand a grinding wheel mounted on a shaft carried by said upright, a linkmember pivotally mounted on said upright, an arm member pivotallymounted at one side thereof on said link member with the pivotal axes ofsaid link member and arm member in parallel relation, said arm memberhaving its other side formed with a dovetail guide opening through atleast one end thereof, a block member formed with a dovetail grooveslidably mating the dovetail guide of the arm member in either uprightor reversed position, means holding said block member at any adjustedposition on the arm member, a dresser tool, means for adjustablysupporting said dresser tool at one end of the block member, a tracer,means for adjustably supporting said tracer at the opposite end of theblock member with said tracer extending substantially parallel to and inalignment with said dresser tool, and a template supported by the basein position to cooperate with said tracer, whereby said block member maybe reversed to apply said tracer to the grinding wheel and said tool tosaid template.

2. In a grinding machine having a support and a grinding Wheel mountedon a shaft carried by said support, a carrier, means mounting saidcarrier for universal movement in a plane on said support, a blockmember, said carrier and block member having a slidably mating dovetailguide and groove connection in either upright or reversed position ofsaid block member, means holding said block member at any adjustedposition on the carrier, a dresser tool, means for adjustably supportingsaid dresser toolat one end of the block member, a tracer, means foradjustably supporting said tracer at the opposite end of the blockmember with said tracer extending substantially parallel to and inalignment with said dresser tool, and a template mounted on the supportin position to cooperate with said tracer whereby said block member maybe reversed to apply said tracer to the grinding wheel and said tool tosaid template.

References Cited in the file of this patent UNITED STATES PATENTS528,337 Morgeneier Oct. 30, 1894 1,193,049 Olson Aug. 1, 1916 2,305,115Sneed Dec. 15, 1942 FOREIGN PATENTS 448,001 Great Britain May 29, 1936475,096 Great Britain Nov. 8, 1937

